Stress oscillation in amorphous copolyesters due to tensile impact

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Specimens from amorphous copolyester (aCOP) sheets of different composition and molecular mass characteristics were subjected to instrumented tensile impact loading in the speed range of 2-3.7 m/s at ambient temperature. Stress oscillation was observed in the necking phase, especially for the aCOP with smaller entanglement density. It was found that the appearance of stress oscillation is limited to a given frequency or strain rate range (estimated by the ratio of the incident speed and clamped specimen length). Necking occurred by cold drawing which was evidenced by the shape recovery of the broken specimens when heated above the glass transition temperature (Tg≈90 °C). According to polarized light microscopy and differential scanning calorimetry (DSC), the stress oscillation was generated by diffuse shear banding without crystallization. This is the first report according to the authors' knowledge on the stress oscillation phenomenon in amorphous polymers in which crystallization was not involved.

Original languageEnglish
Pages (from-to)1404-1411
Number of pages8
JournalPolymer Engineering and Science
Volume39
Issue number8
Publication statusPublished - 1999

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Crystallization
Molecular mass
Light polarization
Optical microscopy
Strain rate
Differential scanning calorimetry
Polymers
Recovery
Chemical analysis
Temperature
Glass transition temperature

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Chemistry
  • Polymers and Plastics

Cite this

Stress oscillation in amorphous copolyesters due to tensile impact. / Karger-Kocsis, J.; Czigány, T.; Moskala, E. J.

In: Polymer Engineering and Science, Vol. 39, No. 8, 1999, p. 1404-1411.

Research output: Contribution to journalArticle

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